Joomla 1.5 mootools bug fix

I'm running a Joomla 1.5 website with com_Hotproperty 1.0 RC1 installed. Ever since I upgrade to RC1 I've been having problems with the layout and functioning of the site. All because [login to view URL] is loading twice when visiting any com_hotproperty component. If you visit: [login to view URL] You'll notice that everything works fine on the homepage, if you click on "properties" you'll notice that the "login" module is shown by default while it should be hidden. I need to fix this error while keeping everything else intact.